Jack



Patented Apr. 9, 1929. 'I'

UNITED STATES SYDNEY P. semana,l or NEW YORK, N. Y.

Application filed September This invent-ion relates to jacks and whilefit is/particularly adapted for usein connection with automobiles, theinvention is of course not limited to'any particular' use.

An object of the invention isto provide a jack in which the movement ofthe turning parts is compounded or multiplied so as to impart a; rapidmovement to the lifting plunger and also give a maximum movement fromrelatively short members, so that, while all necessary lifting movementis provided,

the jack when collapsed or telescoped will occupy but a relatively7small space.

A further object is to provide a jack of this characterwhich isstrongand compact, which can be keptlubricated and which will give themaximum of movement and power to the minimum of power expended. j

`With these andother objects in view, the invention consists in cert/ainnovel features of construction and combinations and arrangements ofparts which will be more fully hereinafter described and pointed out inthe claims.

In the accompanying drawings- Figure 1 is aview in vertical longitudinalsection showing the parts of my improved jack in their lowermost orcollapsed position;

vFigure 2 is a similar view showing the members of the jack partiallyextended; Figure 3 is an enlarged view in transverse section on the line3 3 of Figure 1.

Figure 4 is a top plan view or" certain details.

1 represents a hollow base and 2 a tubular I upright integral with thebase and of general cylindrical form. The hollow base 1 is closed by aremovable base plate 3 secured thereto vby .screws or other attachingTmeans 4 and havingwebs thereon which supporta ball 6. 7 represents ahorizontally positioned gear wheel having a socket member 8 central inthe bottom thereof which has a thrust bearing on the ball G.

A drive shaft 9 projects through a. bearing 10 in the base 1 and has apinion 11 thereon meshing with the gear wheel 7, and the outer end otthis shaft 5 may be made angular, as shown at 12. to receive a wrench orcrankv or other suitable 'device for imparting a rotary motion thereto.13 is a removable collar located on the shaft 9Vand adapted to removablysecure-the shaft 9 in the base 1.

A vertical post 14 is iixed to the center of gear 7 and turns therewith.This post 14 is located. centrally in the tubular upright 2,

JACK.

14, 1927. Serial No. 219,509.

is externally.screw-threaded and is hollow. A collar 15 is secured inthe upper end of the post 14 and has an angular opening 16 therein so asto receive an angular stem 17 on a screw head 1S. The screw head 1S isof appreciably greater diameter than the post 14 and is externallyscrew-threaded and meshes with the internal screwv threads 19 in ahollow cylindrical plunger 20.

This plunger 2O may carry any suitable saddle or head 21 at its upperend and is pret'- erably of a length to lit approximately within theupright 2 when lowered or collapsed. A sleeve 22 is disposed between thepost 14 and .the plunger 2O and this sleeve has internal screw threads23 at its lower end which engage the external screw threads of the post14.

The parts are so arranged that the upper end 24 of the sleeve 22 engagesunder the screw head 18. This sleeve 22 is provided with one or moreexternal longitudinal keys 24 which move in keyways 25 in an internallythreaded portion of the plunger 2O so as to prevent independent rotarymovement ot' these parts. l

A shell 26 Vis interposed between the plunger 20 and the upright 2, andthis shell is provided with al keyway 27 receiving a key 28 on theplunger V 20. The keyway 27 extends throughout the major portion of theshell but said keyway terminates short of the upper` Vend of the shellso that a shoulder 29 is provided on the shell and is engaged by the key28 when the latter reaches the posit-ion shown in Figure 2, so that acontinued upward movement of the plunger will draw the shell with it andVthis shell will cover the joint between the plunger 20 and the sleeve22 and strengthen theV telescoping parts and cover their joint when thejack is extended.

I also provide in the shell 26 an external longitudinal groove 30 whichextends 'from its upper end to a point adjacent its lower end,'an`d Ilocate a screw or other-removable device 31 in the upright 2 which ridesin this groove and which engages a shoulder 32 at the lower end of thegroove to prevent further kupward movement ofthe shell, or, in otherwords, to limit the upward movement thereof.

In describing my improved device I have referred to the parts as beingtubular, cylindrical7 etc., and it is obvious that the invention is notto be limited to the shape of the parts as this may be varied. I havealso referred to certain parts as having keys and others as havingkeyways andv grooves,

Ya'ndfthis is of.A course to be understood as de# scribing theillustrations only as these parts may be reversed as desired.

The operation is as follows.:

Assuming the parts to be in the positionv shown in Figure l, a turningmovement el.

shaft 9 in one direction will, through the medium of pinion Vl1 and gearwheel 7, iin-part rotary motion to the post 14. As vthis post hasscrew-t-l'irea'ded'- engagement with the sleeve 22 it'will cause sai'd.lsleeve to moveupfwardly.

Furthermore', by reason' ol the' coupled engagement ofthe angular stem17 to post 114,

this stem will likewise be turned, and the lscrew 18 thereon meshing,with the internal had. lfVhen the plungerreaclies the position 'shown inFigure 21,. Vthe key 2S will cause the shell to move upwardly, coveringthe juncturebetween the plunger and the sleeveV and vreinforcing thedevice as a whole init-s tele- .'fscoping'action. To collapse the jackthe shalt 9" isturned in the opposite direction and the parts will vbetui-ned downwardly and mainly enclosed. within the4 upright 2', asclearly indicated in Figure: l'. i

lVhile I have illustrated what I believetto be aprelerred. embodimentotmy invention,

i it is .obvious` thatlvaifious alterations and `changes might be madein the general form ot the parts described without `departing from theinventionand hence `l dolnot limit myself to the precise details setforth but consider myself-atliberty t'o. make such changes andalterations as fairly fall within the spirit and scope ol the appendedclaims.

l,Icla'ima I i l. A jaclnincluding a hollow upright, a

A rotary externallyscrew-threadedhollow post in the; upright, means forturning the post, a vertically movable plunger, anV V angular stemtelese'oping inv the' post, a sciew head on the stem engaging'tlieinternal threads oit the plunger,y and a sleeve on the postfengaging thescrew headand having internal screw-r threaded engagement wit-h thepost.

2'. jack, including a hollow upright, a rotar externally screw-threadedfhollow post in the uprigli't, means for `turning the post, averticallyV movable plunger, an'V angul lar stem telescoping in thepost, .ascr'ew head C I tween the plunder and the u' right and caused,to move with on the stem' engagingthe internal threads of Y Y the.plunger, asleeve' on-the postengaging the ed engagement with the post,and a shell bescrew head and having internal screwethreadi the'plunger-alter th'elatter has moved a defined dist-ance. f. 'i

i 3'. YA jack, including ai. holle-w'upri-ghn-a notary externallyscrew-threaded hclloi1 post in 'the upright, means for turning the post,

aY--vertically movable plunger, an angular stem telescoping inthe post,a screw head on the stem engaging the internal threads ot theplunger,'and a sleeve on the post `engaging the screw head and havinginternal screwthlreade'd engagement with the post, said upright and postheld against longitudinal movem e`nt*'andr all other of said parts keyedtogether whereby Van Yindependent rotary movement is prevented. Y f v 4.A jack, includ'ing'a hollow post, a rotaryy externallyscrew-threadedhollow post in the upright, means for turning the post, avertically movablev plunger, a plurality ot' means operated by theturning movement of the post' to impartjlongitudinal movement to theplunger and compound said movement, and a shell betweeny the plunger andthe upright and caused' to movey with the plunger alter the latterliasmoved a defined distance, said upright and post held'againstlongitudinal movement andV allother ol said parts l'reyed togetherwhereby"independent rotary movement is'prevented. f i i 5; A jack,includ-ing a hollow upright, a rotary externally screw'fthreaded hollowpost in the upright, means for turning the post, a vertically movable'-plunger, an angular stem telescoping in the post, a screw head on thestem engaging the internal threads of the plunger, alsleeve on the postengaging the screw headv and having internal screwA threaded engagementwith the post, and a shell between the plunger and' the upright andcaused to move with the plunger after the latter has moved a deli-neddistance, said uprightand post held against longitudinal movement andall other ol said parts keyed together whereby independent rotarymovementis prevented.'

6. A jack, including a hollow base, an upright on the base,y removableplate secured to the bottom of the base', al gear wheel 'having a thrustbearing on saidvba'se plate', a pinion engaging the gear wheel, ashal'tsecured to the pinion and .projecting through the base, anexternallyscrew-threaded hollow post fixed to turnv with the gear wheel,an internally screwthreaded plunger, a sleeve having internalAscrew-threaded engagement with the post, stemmounted to turn with thepost and telescope therein, a screw head on thestem engagingthe'internal threads of thel plunger and engaged by: the upper end ofthesleeve, and said sleeveV and Vplunger keyed together.v 7

7. A'Jacl, including'a hollow'base, uprighton the base, a removableplate secured to the bottom of' the base, gear wheel having athrust-bearing on said hase'plate, a pinion cngagingthe gear wheel,a'shait secured to the pinion andiprojeeting through the base, anexternally screw-threadedhollow -post xed to turn with `the gear wheel,an

internally screw-threaded plunger, a sleeve having internalscrew-threaded engagement with the post, a stern mounted to turn withthe post and telescope therein, a screw head on the stern engaging theinternal threads ofthe plunger and engaged by the upper end of thesleeve, and said sleeve and plunger keyed together, and a shell keyed tothe outside of the plunger.

Signed at New York, in the county of New York and State of New York this12th day o'f September, A. D. 1927.

SYDNEY P.' BARKER.

